Dark skin pigmentation: Higher melanin levels reduce the skin's ability to produce vitamin D from sunlight.
Aging: As people age, their skin becomes less efficient at producing vitamin D.
Obesity: Vitamin D is stored in fat tissue, reducing its availability in the bloodstream.
Certain medical conditions: Conditions like Crohn's disease or celiac disease can impair vitamin D absorption.
Medications: Some medications, like corticosteroids or anticonvulsants, can interfere with vitamin D metabolism or absorption.
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